Vibratory grinding mill of the drum type



Jan. 3, 1967 J, MAEDER 3,295,771

VIBRATORY GRINDING MILL OF THE DRUM TYPE Filed Nov. 9, 19 64 2 Sheets-Sheet 1 L t F g] [L Jan. 3, 1967 H. J. M AEDER VIBRATORY GRINDING MILL OF THE DRUM TYPE 2 Sheets-Sheet 3 Filed Nov. 9, 1964 United States Patent 0 3,295,771 VIBRATGRY GRINDING MILL OF THE DRUM TYPE Heinz Iochem Maeder, Cologne-Deilbruclt, Germany, as-

signor to Kliickner-HumboIdt-Deutz Airtiengesellschaft, Cologne-Donia, Germany, a corporation of Germany Filed Nov. 9, 1964, Ser. No. 409,673 Claims priority, application Germany, Nov. 19, 1963, K 51,411 9 Claims. (Cl. 241-153) My invention relates to drum-type continuously operable vibratory mills in which one or more vibrating grinder drums containing a number of balls or other grinder bodies are provided with a screen-like partitioning wall extending across the interior of the drum closely upstream of the outlet opening thereof.

A drum of the aforementioned type is shown and described in the copending application Serial No. 291,691, filed July 1, 1963, now Patent No. 3,212,722 of which I am a co-inventor. According to the apparatus of this copending application, the overflow level of the ground material in the grinding mill can be varied by adjusting an overflow gate.

It is an object of my invention to provide a vibratory grinding mill of the drum type that will afford a uniform discharge with a steady grinding level of the grinder drum to a degree far superior to the heretofore known vibratory grinding mills of this type.

It is another object of my invention to provide a vibratory grinding mill of the drum type with an improved discharge device which is adjustable for eflecting slow or rapid discharge of ground material from the grinding drum.

It is a further object of my invention to provide a vibratory grinding mill of the drum type which minimizes wear and tear of the grinding drum liner due to contact with the load material.

It is yet another object of my invention to provide a vibratory grinding mill of the drum type with structure that will effect uniform transfer of load material from one grinding drum to another.

With these and other objects in view, and in accordance with my invention, I provide as an improvement in the grinding mill of the aforementioned copending application Serial No. 291,691, a discharge device which comprises one or more hollow sleeve or tubular assemblies, interior of the hollow assembly or assemblies communicating with an outlet opening. By providing openings of suitable shape in the walls of the tubular assembly or assemblies and by varying the width thereof, a particularly sensitive adjustment of the grinding material discharge can be obtained.

In accordance with another feature of my invention, each of the hollow assemblies comprises two tubular members that are turnable with respect to one another about a common axis, openings being provided in the Walls of these members which, due to the turning of one of the members, can be covered entirely or partly by the wall of the other member. The openings are advantageously in the form of conical or isosceles triangular slots having a vertex angle pointing in a downward direction. Such a slot construction renders it possible to operate with a slot having a very acute vertex angle at a low level of the overflow edge of the discharge device when the grinding mill is to be emptied slowly. In addition, due to a narrowing or widening of the slot, the pressure of the load level which is smaller or larger depending upon the location of the overflow edge of the discharge device, can be compensated.

In accordance with an additional feature of my invention and for insuring that the ground material cannot rise above a specific level in the drum, the hollow members are advantageously provided at the upper end thereof with an end wall in which one or more openings are formed.

For the known drum-type vibratory grinding mills, the shell liners, which take the wear'due to engagement with the load material, are interrupted at the locations of the tangentially disposed inlets. The edges of the interrupted locations are, however, exposed to an exceptionally great amount of wear and tear and the respective liners must therefore be frequently replaced. The replacement is difiicult and is accompaniedby considerable expenditure of time. To overcome these defects, I provide, in accordance with a further feature of my invention, a guide plate located in front of the inlet opening in the upper region of the grinding drum and projecting from 'the drum wall and covering Or -shielding the opening. In this way, wear and tear of the shell liner proper or of the screen drum is avoided in the vicinity of the inlet location. Only the guide plate requires replacement from time to time, which, however, presents no difliculty. By means of such a construction, the material which is supplied into the drum is simultaneously deflected toward the drum walls and a uniform transfer of the material from one grinding drum to the other is thereby achieved.

The aforementioned and other objects, advantages and features of my invention will be apparent from the following description of a specific embodiment thereof illustrated by way of example in the accompanying drawings, in which.

FIG. 1 is a side elevational view of a vibratory mill having two grinder drums embodying the features of my invention;

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1 in the direction of the arrows;

FIG. 3 is a cross-sectional view of an enlarged scale taken along the line III-III of FIG. 1 in the direction of the arrows;

FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3 in the direction of the arrows;

FIGS. 5 and 6 together represent an exploded view in cross section of the cylindrical discharge device members shown in FIG. 3;

FIG. 7 is a top plan view of FIG. 5; and

FIG. 8 is atop plan view of FIG. 6.

Referring now to the drawings, and particularly to FIGS. 1 and 2, there is shown a grinding mill of the drum type constructed in accordance with the invention, which includes cylindrical grinder drums 1 and 2 located one above the other. The drums are connected one to the other by means of a tube or pipe 3 serving on the one hand as material outlet for the upper drum and on the other hand as supply tube for the lower drum. The material to be ground is supplied to the grinder drum 1 through a feed pipe 4, and after passing through both grinder drums is withdrawn from the drum 2 through an outlet pipe 5. The grinder drums 1 and 2 are mounted in bridge members 18 and are set in vibration by means of a drive mechanism, comprising for example a stationary electric motor 19 which drives, through a universal connection therewith, a shaft 20 that carries unbalance weights 21, as more fully shown and described in the aforementioned copending application Serial No. 291,691, the drive mechanism being located for the most part advantageously, for example, in the bridge members between both grinder drums.

Within each drum, there is located behind a screenlike partition wall represented diagrammatically by the broken line a or a, a discharge device b or b which, in

accordance with my invention, comprises two tubular members 6 and 7 (FIG. 3) located one above the other and extending into an outlet chamber formed by the partition wall a, a in the grinder drum. The members 6 and 7 can :be turned relative to one another about a common axis and are of cylindrical form superposed one on the other. As shown in FIGS. 4, and 6, openings 8 and 9 are provided laterally in the walls of members 6 and 7, respectively, opposite one another and are of adjustable width. These openings are in the form of slots of conical or isosceles triangular shape with the vertex angle extending in a downward direction from the top of the member as shown in FIGS. 5 and 6. This construction of the slots permits a particularly sensitive adjustment of the accumulation of grinding material in the grinder drum. Furthermore, by varying the width of the openings, the vibratory mills can be largely accommodated to the particular grinding conditions and a uniform product can be obtained with a steady grinding load level of the grinder drum. The conical or triangular form of the slots further has the advantage that when the width of the slots is narrowed, the pressure of the load level which is greater or less depending on the location of the overflow edge of the discharge device, can be compensated. Furthermore, this form of the slot permits operation with the overflow edge at a low level. This is particularly advantageous if the grinding mill is to be emptied slowly.

At the upper ends thereof, the cylindrical members 6 and 7 are closed respectively by an end wall 10 and 11 (FIGS. 5 and 6). Similar large openings 12 and 13 (FIGS. 7 and 8) are provided in these end walls 10 and 11 through which the ground material can discharge from the vibratory drum even when the slots 8, 9 are closed. Clogging of the vibratory grinding mill drum is thereby avoided.

The outer cylindrical member 6 is turnably arranged on the inner member 7 (FIG. 6). Turning of the outer member 6 with respect to the inner member 7, which is rigidly connected, for example by welding to the grinding drum wall, is effected by means of a screw 13. Above the cylindrical members 6, 7, there is provided an opening 1' in the grinder drum through which an adjustment of the members with respect to one another can be effected. During operation, this opening 1' is closed by means of a rubber stopper k.

In order to avoid wear and tear of the shell liner (not shown) and the screen drum in the vicinity of the inlet locations, the inlet openings 14, 15 are covered or screened by giude plates 16, 17 extending from the drum walls (FIG. 2). By means of these guide plates, material fed through the openings 14, 15 into the grinder drums 1 and 2 are advantageously deflected to the drum walls and the grinder bodies located in the drum are simultaneously prevented from coming into contact with the inlet openmgs.

The form of the openings in the walls of the hollow members are not limited to those shown and described for the embodiment of this application. The openings in the walls of the hollow members can for example be curved or the like. The vibratory mill can in this manner be widely accommodated to the individual characteristics of the material to be ground and, consequently, to the characteristics of the desired grinding results.

To those skilled in the art, it will be obvious, upon a study of this disclosure, that vibratory grinding mills according to my invention can be given embodiments other than particularly illustrated and described herein, without departing from the essential features of my invention and within the scope of the claims annexed hereto.

1 olaim:

1. A continuously operable vibratory grinding mill comprising at least one vibratory grinder drum having an axis extending substantially in a horizontal direction, said drum having an upper inlet opening for material to be ground at one end thereof and a lower outlet opening for the ground material at the other end thereof, a screen partition extending across said drum axis and secured in said drum at a location spaced axially from said other end, said partition forming at said other end an outlet chamber above said outlet opening adapted to receive a quantity of the ground material at varying depth therein, and a discharge device comprising a hollow tubular member mounted in said outlet chamber above said outlet opening, said hollow tubular member :being formed with at least one lateral longitudinally extending opening so that said outlet chamber communicates with said outlet opening through the lateral opening and hollow interior of said tubular member whereby the quantity of ground material accumulating in said outlet chamber is dischargeable at substantially all depths of accumulations through said openings.

2. A continuously operable vibratory grinding mill comprising at least one vibratory grinder drum having an axis extending substantially in a horizontal direction, said drum having an upper inlet opening for material to be ground at one end thereof and a lower outlet opening for the ground mtaerial at the other end thereof, a screen partition extending across said drum axis and secured in said drum at a location spaced axially from said other end, said partition forming at said other end an outlet chamber above said outlet opening, and a discharge device comprising a pair of sleeve members located one Within the other and mounted in said outlet chamber above said outlet opening, said sleeve members being each formed with a lateral opening in registry with one another and being turnable relative to one another about a common axis whereby said lateral openings may be turned out of registry with one another and covered in whole or in part.

3. A continuously operable vibratory grinding mill comprising at least one vibratory grinder drum having an axis extending substantially in a horizontal direction, said drum having an upper inlet opening for material to be ground at one end thereof and a lower outlet opening for the ground material at the other end thereof, a screen partition extending across said drum axis and secured in said drum at a location spaced axially from said other end, said partition forming at said other end an outlet chamber above said outlet opening, and a discharge device comprising a pair of sleeve members located one Within the other and mounted in said outlet chamber at said outlet opening so that the interior of said sleeve is in communication with said outlet opening, each of said sleeve members being formed with a lateral triangular slot pointing downwardly from the upper end thereof and being in registry with one another, said sleeve members being turnablc relative to one another about a common axis whereby said triangular slots may be turned out of registry with one another and wholly or partly covered.

4. A continuously operable vibratory grinding mill according to claim 1, said member having an upper end wall formed at least with one opening exposing the hollow interior of said member to said outlet chamber.

5. A continuously operable vibratory grinding mill according to claim 1, including a guide plate mounted within said drum and extending across said inlet opening for deflecting the material supplied to the grinding mill through said inlet opening.

6. A continuously operable vibratory grinding mill according to claim 1, including a guide plate secured at one end to a wall of the drum, said guide plate being spaced from and extending across said inlet opening for deflecting the material supplied to the grinding mill through said inlet opening.

7. A continuously operable vibratory grinding mill comprising at least one vibratory grinder drum having an axis extending substantially in a horizontal direction, said drum having an upper inlet opening at one end thereof for material to be ground in the grinding mill and a lower outlet opening at the other end thereof for the material ground in the grinding mill, a guide plate secured at one end to a wall of the drum, said guide plate being spaced from and extending across said inlet opening for deflecting the material supplied to the grinding mill through said inlet opening, a screen partition extending across said drum axis and secured in said drum at a location spaced axially from said other end, said partition forming at said other end an outlet chamber above said outlet opening, and a discharge device mounted in said outlet chamber and comprising a member having a hollow interior communicating with said outlet opening, said member being formed with at least one opening exposing the hollow interior of said member to said outlet chamber.

8. A continuously operable vibratory grinding mill comprising an upper and a lower vibratory grinding drum each having an axis extending substantially in a horizontal direction, said drums having respectively an upper inlet opening at one end thereof and a lower outlet opening at the other end thereof, means for connecting the lower outlet opening of said upper drum with the upper inlet opening of said lower drum, a screen partition extending across the axis of each drum and secured in the respective drum at a location spaced axially from the other end thereof, said partition forming at said other end an outlet chamber above the respective outlet opening, and a discharge device mounted in each of said outlet chambers and comprising a member having a hollow interior communicating with the respective outlet opening, said member of each of said discharge devices being formed with at least one opening exposing the hollow interior of said member to the respective outlet chamber.

9. A continuously operable vibratory grinding mill comprising an upper and a lower vibratory grinding drum each having an axis extending substantially in a horizontal direction, said drums having respectively an upper inlet opening at one end thereof and a lower outlet opening at the other end thereof, a guide plate extending inside each of said drums from a Wall thereof across the respective inlet opening for deflecting material supplied to each of said grinding mills through the respective inlet opening, means for connecting the lower outlet opening of said upper drum with the upper inlet opening of said lower drum, a screen partition extending across the axis of each drum and secured in the respective drum at a location spaced axially from the other end thereof, said partition forming at said other end an outlet chamber above the respective outlet opening, and a discharge device mounted in each of said outlet chambers and comprising a member having a hollow interior communicating with respective outlet opening, said member of each of said discharge devices being formed with at least one opening exposing the hollow interior of said member to the respective outlet chamber.

References Cited by the Examiner UNITED STATES PATENTS 1,692,974 11/1928 Barker 241153 X 1,794,041 2/1931 Stone 241- 2,507,917 5/1950 Lonngren 24l153 X 2,760,729 8/1956 Mittag 241-137 3,134,549 5/1964 Quackenbush 241-171 X FOREIGN PATENTS 802,891 10/1958 Great Britain. 328,828 5/1958 Switzerland.

WILLIAM W. DYER, JR., Primary Examiner.

ROBERT C. RIORDON, Examiner.

a H. F. PEPPER, Assistant Examiner. 

8. A CONTINUOUSLY OPERABLE VIBRATORY GRINDING MILL COMPRISING AN UPPER AND LOWER VIBRATORY GRINDING DRUM EACH HAVING AN AXIS EXTENDING SUBSTANTIALLY IN A HORIZONTAL DIRECTION, SAID DRUMS HAVING RESPECTIVELY AN UPPER INLET OPENING AT ONE END THEREOF AND A LOWER OUTLET OPENING AT THE OTHER END THEREOF, MEANS FOR CONNECTING THE LOWER OUTLET OPENING OF SAID UPPER DRUM WITH THE UPPER INLET OPENING OF SAID LOWER DRUM, A SCREEN PARTITION EXTENDING ACROSS THE AXIS OF EACH DRUM AND SECURED IN THE RESPECTIVE DRUM AT A LOCATION SPACED AXIALLY FROM THE OTHER END THEREOF, SAID PARTITION FORMING AT SAID OTHER END AN OUTLET CHAMBER ABOVE THE RESPECTIVE OUTLET OPENING, AND A DISCHARGE DEVICE MOUNTED IN EACH OF SAID OUTLET CHAMBERS AND COMPRISING A MEMBER HAVING A HOLLOW INTERIOR COMMUNICATING WITH THE RESPECTIVE OUTLET OPENING, SAID MEMBER OF EACH OF SAID DISCHARGE DEVICES BEING FORMED WITH AT LEAST ONE OPENING EXPOSING THE HOLLOW INTERIOR OF SAID MEMBER TO THE RESPECTIVE OUTLET CHAMBER. 